Topic: Degree of Comparison,

Best Answer Explained in Below-:

The correct answer to the sentence 'Cuba is ___ sugar-growing areas in the world.' is option C, "one of the largest." This choice is grammatically and contextually accurate.

The phrase “one of the largest” is used to describe something as being among a group that includes the most significant or notable examples. In this context, saying that Cuba is "one of the largest sugar-growing areas" indicates that Cuba ranks among the top regions globally for sugar production, implying a comparison to other significant sugar-growing areas.

Option A, “one of the larger,” while somewhat acceptable, is less precise because “larger” does not carry the same weight as “largest” in this context. Option B, “one of largest,” is grammatically incorrect as it lacks the necessary article "the." Finally, option D, “largest,” would imply that Cuba is the single largest, which is incorrect given the presence of other significant sugar-producing countries.

Thus, "one of the largest" conveys the intended meaning effectively and correctly places Cuba within a comparative context.